Lunar calendar 2013. Moon Phases. Lunar calendar. A lunar calendar is a calendar that is based on cycles of the lunar phases. Because there are slightly more than twelve lunations (synodic months) in a solar year, the period of 12 lunar months (354.37 days) is sometimes referred to as a lunar year. A common purely lunar calendar is the Islamic calendar or Hijri Qamari calendar. A feature of the Islamic calendar is that a year is always 12 months, so the months are not linked with the seasons and drift each solar year by 11 to 12 days. It comes back to the position it had in relation to the solar year approximately every 33 Islamic years. It is used mainly for religious purposes, but in Saudi Arabia it is the official calendar.
Other lunar calendars often include extra months added occasionally to synchronize it with the solar calendar. The oldest known lunar calendar was found in Scotland; it dates back to around 10000 BP.[1] Lunisolar calendars[edit] All these calendars have a variable number of months in a year. See also[edit] Moon Phases and Lunar Calendar for Dublin, New Hampshire. Moon phases for London, United Kingdom - England in year 2015. Moon calendar 2014. Moon Phases Calendar / Moon Schedule.